| 摘要 |
PURPOSE:To raise output efficiency and to expand the linearity space of a sloped magnetic filed while further reducing inductance for reducing a sound generated by Lorentz force, by constituting four coils each of the concentric circle type coils tracing circular arcs at a prescribed angle in the slope magnetic field coil combining four coils. CONSTITUTION:Four pieces of concentric circle type coils 1 are combined, and one concentric circle type coil 1 is so composed that the concentric circular inside conductor 11 and the outside conductor 12 having different radiuses centering about a Z-axis are connected in series. The inside conductor 11 is thick and one piece while the outside conductor 12 is thin and divided into three pieces for being connected in parallel. Such concentric circle type coils 1 like these are piled up. The concentric circle type coils 2-4 are to be made of the same construction with the concentric circle type coil 1 only having different opening angles. The outside conductor 12 comes to perform a function as a magnetic shield to a magnetic field generated from the inside conductor 11 so that almost no eddy current can be generated in a main magnetic field magnet 5 by regulating the number of the outside conductors 12 and the relation between the radius of the inside conductor 11 and the radius of the outside conductor 12.
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